Wave transmission system



SR wss Ff 19632905@ June 14,'1927.

R. V. L. HRTLEY uv'a musa ISSIOX SYSm` Filed Auz. 14. 1924 Patented 14, '1927... l

l Unirse srerss sereni' ossics.

nenni: v. n. mm or com omen, nsw missy, .issrsnon ro wns'rnnn' ELECTRIC 69mm, 0F NEW i l NEW YORK;

YORK, N. Y., OGEPORATION 0I` vvnvn rnestoivsrsrnin Y muuu ma August 1 4. im. semi iro. 731,914.

'tric c stal controls the plane of polariza tion o light to produce a visible signal.

.Another feature relates to switchin ineens in a radio receiving system. by whicn a plurality of different signal receivers may be .alternately coupled to an antenna andv the antenna -ma be simultaneously tuned to di'erent wave engths to render it resonant to waves of the corres riding frequency.

. The invention bros ly comprises means for receiving electric waves combined with a selective device responsive to reivedyaves u of a particular frequency. The selective device includes means for polei'iri a beam of light so that an object upon whic. the beam is directed is normally unilluminated and additional means, responsive to the received waves of a particular frequency to rotate the plane of polarization of the li `litbeam and cause the object to besoins uminous.

v The luminous olneet then ineicetes to an observerthat signals -of a. particular frequency are being received. v

Switching means is also provided whereby the wave reoeivin means, for exemple an antenna 'mcy be nnectcd from t e light 'signal device' nsive' to weves of a. 'particular frequency and coupled to o sound signal device, fo exam le o radio telephone receiving set, arranged to be responsive to received waves of ln. free quency. The switching ineens is designed to simultaneously adjust certain tuning elements in the system to the corresponding frcquei'icyi.

In the drawings:

Fig. 1 .is e. circuit diagram of a radio receiving system for producing l. light signal.

Fig. 2 is a. circuit diagram ois vrudio reoeving system having means :for alternate] connecting a light signal device or o soun .signal device to en antenna..

The radio receivin system', the circuit di- Il agi-am of which is ustrated in Fig. 1, will now be described;

Acntenna. 10 is coupled to n piezo electric device 15 arranged to rotate the plane of polarization of a li ht beam 20, drecd upon s. ti'anslucent'o ject 21. The antenna 10 is connected to ground in series with the prima' winding of a variable transformer 11. T e seconde winding of this trans- 'former is connect in parallel to an adjustn ble condenser 12', constituting e resonant; circuit therewith. They terminale of oondansen. 12 ire connected to plates 13 and 14 o piezo electric device 15 which nrc an ran ed adjacent to opposite sides of a. par 't0 alle epiped 16 cut from e quartz stal.

Light from e. sourcev 25 is coicid'gnsed by lensl26 und is directed against one face of n Nicol prism or other like polarizing de vicef2?. Adjacent to the opposite face of Il the prisni 27 and nrran to receive light from prism 27 is the piezo electric cristal 16. A second Nicol prism or other ht laiizing device 28 is arranged to receive ight transmitted through the crystal 16, md l0 ispositioned so that it is crossed with respect tothe r1sin27wlienthecrystal16islt rest. T us, noi'i'nelliv)y no light is transmitted to the translucent o 'ect 21.

The crystal 16 is dl ural uency corre. riding to the frequency o waves whi it is desired to receive. The resonant circuit including the secondary winding of transformer 11 und condenser 12 is prefereblytuned to the deo sited frequency. By virtue of this fact the crystal 16 is prevented 'from responding at anyvgther of its natural encies.

en waves of the desire frequency nre received by antenna 10 they are transmitted es tliiouglcil tersatifineil 11 to the resonant circuitan sternntingclisrgesn .4 the plates 13 and 14. The Rini: thereupon set into vibration et the desired frequency. This c v stal is sherply resonant I0! and consequently oes not respond to roceived yvvaves of a frequency other than that to vvhicli the resonant circuit is tuned and to which the crystal 16 is designed to give ren'se. The vibration of crystal 16' lio-1Q4` J uces a corresponding otetion of the e ofrlarization of the 'light beam 20.PAo f csigned to have a net.

gly light is thereupon transmittedto l 'die translucent @bien 21 weging it i0 be.

come luminous as an indication that waves of the desired frequency are being received. The object 21 may be any device sensitive to light as for example a film upon which a record of the light variation may be e. le radio recei system,' the circuit diagram of which is l own in Fig.' 2, comrises an antenna 10, a hoolrswitch 3 0, a light signal device 35 and a sound receiving device 40. The antenna isconnected to ground by a' path including the primary winding 'of transformer 31, armatures 32 and 330i switchO and adjustable condenser 34. A secondary winding 36 of transformer 31 the terminals of which are connectcd to armatures 38 and 39 respectively 'of lswitch 30 is arranged to be connected in parallel with either one of two adjustable .condensers37 and 37 by the operation of.

" switch to form resonant circuits there 'tric device 15. The 'armatures 32, 33, 38

and 39- of switch 30ers arranged to be simultaneously operated by 'a switchhoolr 41 arranged to support a telephone receiver 42 connected to radio receiver 40. The input terminals of the radio receiver 40 are connected to make contacts 43 and 44 amociated with armatures 38 and 39 respectively.' An adjustable condenser 45 has. its terminals connected to the make contacts 46 and.47 associated. with armatures 32 and 33 respectivel The piezo electric .device 15 is arrang to control the plane of polarization of a beam of light from source 25 directed by lens 26- throufh prisms 27 and 28 upon the translucent object 21 in the manner de scribed in connection with the ent illustrated in 1.

' The station ustrated in Fig; 2 may be called by waves havin a `frequency correpondinv to the' natur frequency of piezo ectric Ldevice' 15 to which resonant circuit -37 is tuned.l When waives of this freguenc'y are received by antenna 10 the ob- )ect 21 becomes luminous as already described. This indicates to an attendant that a transmitting station is calling. Tele hone communication may be established wi the transmitting-station byA removing receiver 42frcm switchhook 41. 'The armatures of thereby moveJnnder their inherent light si nected inntenna 10 and the telephone waiver substituted therefor. Likewise condenser 34 which normally. tunes the an tenne circuit to the frequenc of waves received by goal device 35 s disconnected and condenr is substituted therefor.

Condenser 45 is provided for tuning the antenna circuit to the frequency of waves to be received by radio receiver 40. By the action of armatures 38 and-39 condenser 37 is disconnected from winding 3 6 and condenser 37 substituted therefor which forms a resonant with .this'winding which is .tuned to the carrier frequency used in 'connectionfvith receiver 40.

The statienshown in Figure 2 may be one of a plnrality'of stations operatin over l ectve one or a plurality-of antenn. signaling is obtained by employingv piezo electric devices adjusted to be resonant at different frequencies The sound receivers at diierent stations may be .operated on the cairier wares of the same or dicrent frequencies. l

Althouffh this invention has been illustrated. and described as embodied in certain specific circuit arrangements its limits are not defined thereb but only by the scope of theappcnded c aims. g

What is claimed is:

-1. A communication system com rising means for receiving. carrier waves m a remote station2 a source of light, two crossed Nicol prisms in the ath thereof, whereby the plane polarized 'ght the first prism is prevented from passing means between said prisms said received waves to rotatethe plane of polarization of a beam o1- light, `and means responsive to' light traversing both of said prisms to produce an indication that the remote station is.

2. Afsignsl receiving station comprising means. or rece: inco ener an iiidicating devicomgresponixeg to gylanzedV light to indicate a call,an optica associated with said mea and controlled thereby in accordance with xneomin to eii'ect die calling operation, an means' under control of an imiter at said. receiving station for nnecting said calll indicating device from said energy receiv' ing means and connecting in lieu thereof a communication receivin apparatus.

In witns whereof, hereunto subscribe my name this 7th day of August, A. l). 1924.

e'sccend,4 I responsive to energy .Y

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